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Finding the Fourth Proportional to 721,885.47, 996,189.86 and 399,588.63

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Solution

The fourth proportional to 721,885.47, 996,189.86 and 399,588.63 is: 551,425.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,885.47 : 996,189.86 = 399,588.63 : x
  2. Step 2: Convert to fraction form
    721,885.47/996,189.86 = 399,588.63/x
  3. Step 3: Cross multiply
    721,885.47x = 996,189.86 × 399,588.63
  4. Step 4: Simplify right side
    721,885.47x = 398,066,141,377.29
  5. Step 5: Solve for x
    x = 398,066,141,377.29/721,885.47
  6. Step 6: Final answer
    x = 551,425.62

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.